Everything You Need to Know about Narcissists, Psychopaths, and Abuse - click on this link: http://www.narcissistic-abuse.com/faq1.html
People suffering from the Avoidant Personality Disorder feel inadequate, unworthy, inferior, and lacking in self-confidence. As a result, they are shy and socially inhibited. Aware of their real (and, often, imagined) shortcomings, they are constantly on the lookout, are hypervigilant and hypersensitive. Even the slightest, most constructive and well-meant or helpful criticism and disagreement are perceived as complete rejection, ridicule, and shaming. Consequently, they go to great lengths to avoid situations that require interpersonal contact - such as attending school, making new friends, accepting a promotion, or teamwork activities. Hence the Avoidant Personality Disorder.
Inevitably, Avoidants find it difficult to establish intimate relationships. They "test' the potential friend, mate, or spouse to see whether they accept them uncritically and unconditionally. They demand continue verbal reassurances that they really wanted, desired, loved, or cared about.
When asked to describe Avoidants, people often use terms such as shy, timid, lonely, isolated, "invisible", quiet, reticent, unfriendly, tense, risk-averse, resistant to change (reluctant), restricted, "hysterical", and inhibited.
(From the book "Malignant Self-love: Narcissism Revisited" by Sam Vaknin - Click on this link to purchase the print book, or 16 e-books, or 3 DVDs with 16 hours of video lectures on narcissists, psychopaths, and abuse in relationships: http://www.narcissistic-abuse.com/thebook.html)